CVE-2021-29415: Nordicsemi NRF52840 Firmware

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

The elliptic curve cryptography (ECC) hardware accelerator, part of the ARM® TrustZone® CryptoCell 310, contained in the NordicSemiconductor nRF52840 through 2021-03-29 has a non-constant time ECDSA implemenation. This allows an adversary to recover the private ECC key used during an ECDSA operation.

Affected products

• Nordicsemi NRF52840 Firmware: up to and including 2021-03-29

Published 2021-05-21. Last modified 2026-06-17.